Question: T-F-1: There is stable heat transfer between two large plates with a sufficiently large surface. One of the plates is at 27 oC and the

T-F-1: There is stable heat transfer between two large plates with a sufficiently large surface. One of the plates is at 27 oC and the other -73 oC and the distance between them is 1 cm. The emissivity value of the surfaces is = 1. The heat transfer through the unit area between the two plates; a) Calculate assuming that there is still air on the surface in between (Thermal conductivity of still air is 0.0219 W/m.K) b) Calculate assuming it is vacuumed c) Calculate assuming that it is filled with an insulating material with a thermal conductivity of k=0.026 W/m.K. d) Calculate assuming that it is filled with a super-insulating material with a thermal conductivity of k=0.00002 W/m.K.

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